An ________ function f is one for which f(minusx)equalsf(x) for every x in the domain of f; an _______ function f is one for which f(minusx)equalsminusf(x) for every x in the domain of f.
An even function f is one for which f(minusx)equalsf(x) for every x in the domain of f; an odd function f is one for which f(minusx)equalsminusf(x) for every x in the domain of f.